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Elderly people have some problems about their decrease in lower limb function. So, there is a possibility of falling and causing serious injury when standing or sitting. The purpose of this research is to construct a system that enables elderly people to receive safe and high quality rehabilitation. At the first, analysis of trajectory of standing and sitting motion is performed. Thanks to the analysis,...
The reducing of energy consumption for transportation and manipulation of industrial objects is a topical issue. The objects of manipulation are gripped with the use of industrial robot and transported from one position to another. In gripping devices, the lifting force is created on the basis of the aerodynamic effect of lifting appearing due to the use of compressed air. The efficiency of functioning...
To research the effect on the canard rudder aerodynamic layout for the projectile correction, the steering gear model under different aerodynamic layout was established. Various kinds of aerodynamic parameters were obtained through simulation. Through the establishment of the ballistic model of suitable for less spin correction projectiles, the capability of correcting has been received under the...
The authors have studied a motion generation by a wobbling mass attached in the center of a semicircular-shaped body, and showed that generation of a downward motion on a downhill is possible through 4-DOF 1-input underactuated-system with 1-DOF linkage inside the body. The system is, however, difficult to generate a forward motion on level surface. Currently, the authors set the trajectory of the...
This paper describes the prediction and prevention of losing steps in helical teethed linear actuator (HTLA) for artificial muscle. When the rapid external force is applied to the HTLA, it becomes a state of losing steps. Therefore, it is important to predict and prevent this phenomenon. First, we clarified the phenomenon of losing steps in the HTLA by using numerical simulation with 3-D FEM. Next,...
Permanent magnet linear motors (PMLM) are widely used in high precision machineries. With the removal of the transmission elements, the positioning performances of PMLM are easily affected by parameter variations and external disturbances. Various control approaches were proposed, yet it was noticed that majority of these controllers have complex design procedures, and require accurate model parameters...
This paper proposes a new method for tracking the whole trajectory of a ballistic missile from launch to impact on the ground. Multiple state models are applied for the ballistic missile movement descriptions during different phases, while the transition probabilities are modelled in a state-dependent way. A radar sensor is applied to obtain the missile range, azimuth angle and elevation angle measurements...
A mathematical model of electrically charged plastic particles movement in the free-fall electrostatic separator is discussed based on the theoretical analysis and experimental observation. The formulated model considers both field-to-particle and also particle-to-particle interactions and takes into account stochastic characteristics of the model parameters. Simulation of particle motion, therefore,...
The paper presents a concept of factitious force method used for controlling a 3R space manipulator. It was shown that the method works for a rigid manipulator where one of the joints is damaged and can not be controlled. It is important for space applications to have some means of control while the system is compromised. Control law has been proposed for the task of trajectory tracking and practical...
This paper presents a computational framework to identify the effects of wind on the dynamics of a quadrotor unmanned aerial vehicle. Then, using the identified model, the strength and the direction of the wind are estimated with the inertial measurements. The proposed approach is based on a geometric numerical integrator on the special Euclidean group, referred to as a Lie group variational integrator...
In this work we propose a framework for data-driven crowd simulation starting from a small set of trajectories. To model the macroscopic behavior, our method extracts pedestrian trajectories from real videos, clusters all trajectories of pedestrians who intend to reach the same goal, and computes the velocity field associated with each exit region in the scene to guide virtual agents toward their...
The optimal control strategy for a wave energy converter (WEC) with constraints on the control torque is investigated. The goal is to optimize the total energy delivered to the electricity grid. Using Pontryagin's maximum principle, the solution is found to be singular-bang. Using higher order conditions, the optimal control on the singular arc is found as a function of the state and costate trajectories...
In this paper, a new method for learning robotic debarring process motor skills from human skill model is presented. The skill of a human expert is obtained by using the human skill model. This model is implemented in robot control systems that make robots imitate human skills in deburring process tasks. Based on deburring process, family of basic pattern motions are listed by identifying the movement...
Autonomous Underwater Vehicle (AUV) is referred as a promising device to extend human intelligences to harsh underwater environment. Most applications of AUV demand accurate trajectory tracking, however the nonlinear and model inaccuracy constraints on AUV make it challenging to achieve tracking task. In this paper, we are concerned with the trajectory tracking problem for AUV. The AUV is assumed...
This paper presents a framework of simulation-based design for robotic care devices developed to reduce the burden of caregiver and care receivers. First, physical interaction between the user and device is quantitatively estimated by using a digital human simulator. Then we introduce a method for optimizing the design parameters according to given evaluation criteria. An example of trajectory optimization...
This paper presents a distributed force/torque-based UAV(Unmanned Aerial Vehicle) collision avoidance scheme. This scheme is designed to deal in a distributed way with the problem of collisions among rotor craft UAVs, that are sharing the space and flying to different destinations. The proposed scheme has a modular architecture, so that it can be easily included into UAVs with a waypoint controller,...
In this paper, we present a control method for bipedal robotic walking based on insights we obtain from simple models. Inspired by the virtual pendulum (VP) concept and the spring-mass walking models, we propose a force direction control method to redirect the axial force of a compliant leg in order for walking with upright trunk. We first consider a dynamic simulation of a simple planar walking model...
Recently, there has been a growing interest in biomimetic underwater vehicles. Although a lot of research has been conducted in the area of dynamics and kinematics of robotic fish, most of the approaches solve the inverse problem by finding the required force the caudal fin should produce, in order for the robotic fish to follow a trajectory. Others use predefined undulatory body motions which usually...
We studied the force and potential for the vortex around moat corner as an example of the concave edge of the superconducting film by the numerical calculation method. Vortex behavior is one of the significant factors that determine the characteristics of superconducting devices. In some simple cases, such as a straight line with a constant width, the potential for the vortex can be calculated analytically...
Fingertip positions can be tracked using a variety of motion capture methods, raising the question of how to describe, compare, measure effects on, and simulate finger-movement trajectories. This paper provides a solution using stochastic differential equations (SDEs). In this approach, finger positions are conceptualized as Brownian particles. Effects on finger positions, from the stimulus and experimental...
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